<?php
/**
 * PHPExcel
 *
 * Copyright (c) 2006 - 2013 PHPExcel
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * @category   PHPExcel
 * @package    PHPExcel_Shared
 * @copyright  Copyright (c) 2006 - 2013 PHPExcel (http://www.codeplex.com/PHPExcel)
 * @license    http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt	LGPL
 * @version    1.7.9, 2013-06-02
 */


/**
 * PHPExcel_Shared_ZipStreamWrapper
 *
 * @category   PHPExcel
 * @package    PHPExcel_Shared
 * @copyright  Copyright (c) 2006 - 2013 PHPExcel (http://www.codeplex.com/PHPExcel)
 */
class PHPExcel_Shared_ZipStreamWrapper {
	/**
	 * Internal ZipAcrhive
	 *
	 * @var ZipAcrhive
	 */
	private $_archive;

	/**
	 * Filename in ZipAcrhive
	 *
	 * @var string
	 */
	private $_fileNameInArchive = '';

	/**
	 * Position in file
	 *
	 * @var int
	 */
	private $_position = 0;

	/**
	 * Data
	 *
	 * @var mixed
	 */
	private $_data = '';

	/**
	 * Register wrapper
	 */
	public static function register() {
		@stream_wrapper_unregister("zip");
		@stream_wrapper_register("zip", __CLASS__);
	}

	/**
	 * Implements support for fopen().
	 *
	 * @param    string $path        resource name including scheme, e.g.
	 * @param    string $mode        only "r" is supported
	 * @param    int    $options     mask of STREAM_REPORT_ERRORS and STREAM_USE_PATH
	 * @param    string &$openedPath absolute path of the opened stream (out parameter)
	 *
	 * @return    bool    true on success
	 */
	public function stream_open($path, $mode, $options, &$opened_path) {
		// Check for mode
		if ($mode{0} != 'r')
		{
			throw new PHPExcel_Reader_Exception('Mode ' . $mode . ' is not supported. Only read mode is supported.');
		}

		$pos = strrpos($path, '#');
		$url['host'] = substr($path, 6, $pos - 6); // 6: strlen('zip://')
		$url['fragment'] = substr($path, $pos + 1);

		// Open archive
		$this->_archive = new ZipArchive();
		$this->_archive->open($url['host']);

		$this->_fileNameInArchive = $url['fragment'];
		$this->_position = 0;
		$this->_data = $this->_archive->getFromName($this->_fileNameInArchive);

		return true;
	}

	/**
	 * Implements support for fstat().
	 *
	 * @return  boolean
	 */
	public function statName() {
		return $this->_fileNameInArchive;
	}

	/**
	 * Implements support for fstat().
	 *
	 * @return  boolean
	 */
	public function url_stat() {
		return $this->statName($this->_fileNameInArchive);
	}

	/**
	 * Implements support for fstat().
	 *
	 * @return  boolean
	 */
	public function stream_stat() {
		return $this->_archive->statName($this->_fileNameInArchive);
	}

	/**
	 * Implements support for fread(), fgets() etc.
	 *
	 * @param   int $count maximum number of bytes to read
	 *
	 * @return  string
	 */
	function stream_read($count) {
		$ret = substr($this->_data, $this->_position, $count);
		$this->_position += strlen($ret);

		return $ret;
	}

	/**
	 * Returns the position of the file pointer, i.e. its offset into the file
	 * stream. Implements support for ftell().
	 *
	 * @return  int
	 */
	public function stream_tell() {
		return $this->_position;
	}

	/**
	 * EOF stream
	 *
	 * @return    bool
	 */
	public function stream_eof() {
		return $this->_position >= strlen($this->_data);
	}

	/**
	 * Seek stream
	 *
	 * @param    int $offset byte offset
	 * @param    int $whence SEEK_SET, SEEK_CUR or SEEK_END
	 *
	 * @return    bool
	 */
	public function stream_seek($offset, $whence) {
		switch ($whence)
		{
			case SEEK_SET:
				if ($offset < strlen($this->_data) && $offset >= 0)
				{
					$this->_position = $offset;

					return true;
				}
				else
				{
					return false;
				}
				break;

			case SEEK_CUR:
				if ($offset >= 0)
				{
					$this->_position += $offset;

					return true;
				}
				else
				{
					return false;
				}
				break;

			case SEEK_END:
				if (strlen($this->_data) + $offset >= 0)
				{
					$this->_position = strlen($this->_data) + $offset;

					return true;
				}
				else
				{
					return false;
				}
				break;

			default:
				return false;
		}
	}
}
